Material circulating device of circulating fluid bed flue gas desulphurization system

Abstract

The invention discloses a material circulating device of a circulating fluid bed flue gas desulphurization system. The device comprises a cylindrical material conveying chute obliquely arranged between a flue gas desulphurization tower and a flue gas dust-removing device from the low part to high part, the bottom of an inner cavity of the cylindrical material conveying chute is paved with a fluidization cloth layer parallel to the cylindrical material conveying chute, the chute wall at the bottom of the cylindrical material conveying chute is provided with a plurality of air inlet ports, and input ends of the air inlet ports are connected with a fluidization blower through fluidization air pipes. The device is characterized in that a section of fluidization cloth layer at the lower end part of the cylindrical material conveying chute is provided with a grating structure. An airflow baffle plate is arranged between an output end of the air inlet port and the fluidization cloth layer andfixed on the chute wall of the cylindrical material conveying chute. The device can effectively fluidize a circulating material after entering the flue gas desulphurization tower, and can prolong theservice life of easily-damaged components such as the fluidization cloth layer and the like, improve the running reliability and stability of a system, and lower the running cost of the system.

Description

technical field [0001] The invention relates to equipment for purifying flue gas produced by a coal-fired power station, in particular to a material circulation device of a circulating fluidized bed flue gas desulfurization system. Background technique [0002] Coal is the main fuel of power stations in my country at present and for a long time to come. While pulverized coal combustion provides the necessary heat and power resources, it will also bring serious sulfur dioxide SO 2 Pollution has caused huge losses to the ecological environment and industrial and agricultural production. Fundamentally control sulfur dioxide SO in flue gas of coal-fired power station 2 emissions are imperative. [0003] Common flue gas desulfurization technologies for coal-fired power plant boilers include wet, semi-dry and dry desulfurization. Circulating fluidized bed flue gas desulfurization is a semi-dry desulfurization technology developed in the 1980s. Due to the characteristics of low ...

AI Technical Summary

Problems solved by technology

When the above-mentioned circulating fluidized bed flue gas desulfurization system is in operation, there are mainly the following problems: First, because the circulating material pours directly and rapidly to the bottom of the flue gas desulfurization tower along the material conveying chute, it is easy to form a dead angle of air flow in the tower, resulting in its The fluidization performance deteriorates, and disturbs the stability of the flue gas flow field in the tower, and even falls into the fluidization section of the Venturi tube to cause blockage accidents, thereby reducing the reliability and stability of the system operation

However, this device does not solve the problem of effective fluidization of the circulating material entering the flue gas desulfurization tower and the life of the fluidized layer.

At the same time, the circulating material in the device enters the tower at the bottom of the fluidized section of the Venturi tube, and the high-concentration gas-solid two-phase flow is likely to cause blockage of the fluidized section of the Venturi tube

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